Cast-iron gas burner



June 27, 1944.

E. R. KoPPEL cAsT IRON GAS BURNER Filed Aug. 2, 1941 3 sheets-'sheet 41 In@y H R.

ATTUKNEK June 27, 1944. E R KOPPEL A2,352,329

V cAsT IRON GAS BURNER- Filed Aug. 2, 1941 3 Sheets-Sheei't 2 lNvENToR. BY dn A TTOIENEY E. R. KoPPEL 2,352,329

cAsT IRON G'As BURNER Filed Aug. 2', 1 941 3 Sheets-Sheet 5 Emst RKO/Upd INVENTOR.

ATTORNEY:

Patented June 27, i944 narran srnras rArEN'r einen CAST-mon Gas BURNER Ernst R. Koppel, Wauwatosa, Wis., assignor to A. 0. Smith Corporation, Milwaukee, Wis., a corporation oi' New York @werden August 2, 1941, senat No. 405,172 3 claims. (o1. 15e- 115) This invention relates to acast iron gas burner and more particularly to a burner cast in anin' continuous slot in its tubular ring portion thatl will produce a uniform ilame throughout its circular extent.

Another object is to provide a burner that is specifically adapted to be used with a pilot burner.

Other objects will become apparent from the following description and accompanying draw- ,inss in which:

Figure 1 is a Ytop plan view of the burner embodying the invention:

Fig. 2 is a vertical section taken on line 2-2 of Figure 1 and also showing a pilot burner;

Fig. 3 is a section taken on line 3 3 of Figure 1;

Fig. 4 is a section taken on line 4-4 of Figure 1;

Fig. 5 is a top plan view of a modied burner embodying the invention;

Fig. 6 is a vertical section taken online 8-8 of Fig. 5;

Fig. 7 is a section taken on line 1 1 of Fig. 5;

Fig. 8 is a, top plan view of another modiiied form of burner embodying the invention;

Fig. 9 is a vertical section taken on line 9-9 of Fig. 8;

Fig. 10 is a section taken on line Ill-,I0 ot Fig. 8: and

Fig. 11 is a section taken on line II-II oi' Fig. 8.

The preferred embodiment illustrated in Figure I, comprises a, venturi I, with an internal passage 2, cast integrally with a circular tubular end 1 is outwardly flared and has its inner cor- I ners gradually curved, to properly enact distribution of the mixture to the annular channel l extending co-extensively within the circular tubular member 8.

' The tubular member 3 containing the internal channel 4 is prevented from making a continuous ring by the dead ends 8 cast at its circumferential extremities in the form of a dam.

A slot 8 which may have angular or perpendicular sides is preferably located circumferentialiy in the upper surface of the'tubular member 3 and has 'a continuous extent in such surface from one dead end 8 to the other dead end 8.

The slot 8 thus provides for continuous uniform jet of the burning gas throughout the length of the upper circumferential surface of the tubular member 3.

The front of the burner isfshallower than the rear causing the channel 4 to gradually decrease in cross-sectional area from the rear to the front to better maintain uniform pressure of the gas with decrease in its volume toward the front. The larger cross section of channel 4 at therear minimizes the resistance to gas flow where the volume of gas flowing is greatest. v

The ears I0, disposed on the inner rear surfaces of the tubular member 3 are provided with depending lugs Il for suitably securing the burner on a supporting structure.

The venturi I is positioned between the dead ends 8 of the tubular member 3 and is lower at this point than the top surfaceof the tubular member 3 to form a valley like space I2 as shown by Fig. 3 without increasing the general height of the burner.

'I'he space I2 thus provided adapts the burner illustrated to use in combination with pilot burners which have the pilot tube I3 disposed below the thermo element I6 and with an end baille I5 disposed to spread the pilot flame adjacent the slot 8 at at least one of the dead ends 8 of the f tubular member 3.

member 3, having an internal channel I connecting with the passage 2.4

The venturi I is generally tubular in shape with a bell like inlet end 5, a throat or central portion 6 and an outwardly ared outlet end 1.

The bell like inlet end 5 is adapted for suitable connection to a supply of gas and for receipt .of the primary air necessary to develop the gas In such combination the pilot tube I3` and thermo element Il are horizontally positioned over the venturi I between the dead ends 8 in the space I2. The placing of the pilot burner in this manner prevents its elements from being exposed to the direct heat of the main burner due to the shielding eiects of the dead ends 8 of the tubular member 3. Also in this location undisturbed air is available to the pilot burner and the burner lights cannot be extinguished by puis or explosions caused in turning the main burner on and oil.

The modification of the invention shown by Fig. 5 contains the principal features of the preferred embodiment such as the slot IB and the space I1, corresponding to slot 49 and space I2 of Figure 1. Ears I8 similar to ears I0 of Figure 1 are also provided for securing the burner 0n a supporting structure.

'Ihe venturi I9 in this embodiment is cast integrally at its outlet end 20 to the front of the tubular member 2l instead of traveling to the rear of the burner as in the preferred embodiment.

The space I1 is here obtained by depressing the front of the tubular member 2| where it is joined by venturi I9 as shown by Fig. 6 and Fig. 7 and in the space thus provided a pilot burner can be located similarly to the preferred embodiment and with the advantages previously described as present in Figure 1. Thus the gas passing through venturi I9 flows directly into the annular channel 22 at the juncture of the venturi with tubular member 2 I.

This modification of the invention is further distinguished from the primary embodiment by i the fact that the front portion of the burner is deeper than the rear causing the channel 22 in tubular member 2I to travel towards the rear of the gas burner in gradually decreasing crosssectional area.

Fig. 8 represents another modification of the invention but is similar to the preferred embodiment in that it contains the slot 23 and the space 24 corresponding to the slot 9 and the space I2 of Figure 1. It also has ears 25 positioned like ears I0 of Figure 1 to provide means for securing the .burner on a support.

In this modification the venturi 26 is integrally cast with the tubular member 21 at the front of the burner. Fig. shows that the space 24 is formed by depressing the front of the tubu-r lar member 21 and that the venturi 26 passes directly beneath the space 24. The outlet 28 of the venturi 26 flares outwardly into an internally hollow segment 29 disposed at the front of the burner and cast integrally to the inner side of tubular member 21. This segment serves to give additional length to the venturi 26 and provides for a better mixture of air and gas .before the mixture reaches the burner head proper, over that of the modification illustrated v by Fig. 5, since in this modification the length of the constricted throat portion is greater than that of the first modification of the invention to better adapt the burner to use with high pressure gas. In this respect this modification is similar to the preferred embodiment.

Batlles 30 are internally disposed in the outlet end 28 of the venturi 26 to direct the vflow of thev gas around the burner as it passes from the venvturi 26 into the channel 3| of the tubular member 21. l

As'in the first modication of the invention illustrated by Fig. 5, the front of the burner shown in Figs. 8 to 11 is 'deeper than the rear and thus the channel 3I journeys rearwardly in gradually decreasing cross-sectional area.

The slots extending in the circumferential surfaces 'of the tubular members in all of the embodiments illustrated are obtained by a cutting operation which is more readily performed than the drilling of numerous orifices to vform gas Jets. In cutting the slot the cutter enters the space I2 in the preferred embodiment and the spaces I1 and 24 in the respective secondary embodiments and is rotated in a circular path to travel it around the upper surface of the burner coming out again at the spaces I2, I1 and 24 in the respective embodiments. The burner may be rotated relative to the cutter and the slot may be cut or milled either in one pass of the tool or in several passes.

The making of the gas jet in this manner combined with the casting of the burner in one piece presents an invention which is an improvement over previous burners because of its light structure and its less expensive manner of construction. The uniform continuous slot for gas provides a very efficient and well shaped flame for the burner.

I claim:

1. A gas burner comprising a tubular member disposed in generally circular shape with its upper surface interrupted at one side and with its cross-sectional area decreasing from one side to the other, a tubular supply member connected thereto at theside having the larger cross-sectional area and cast integrally therewith, said first-named tubular member having a slotfcut through the upper surface thereof and extending around the member from one side of said interruption to the other side of the same, and a pilot burner disposed in' the space formed by said interruption directly above said supply tube and having means to direct a starting flame to said slot.

2. A gas burner comprising a tubular member having a. slot cut through the walls thereof and walls of substantial thickness to prevent deformation of said slot, dead ends disposed in said tubular member to form a space therebetween, a supply tube passing through said space to the oppositeside of the burner at a height in said space lower than the upper surface of the tubular member, and a pilot burner disposed in the space formed by said dead ends and directly above said supply tube to direct a starting flame to said slot.

3. A gas burner comprising a circular tubular member and a supply tube integrally cast therewith in onev piece, a hollow segment horizontally disposed at the front of said burner and integrally cast to the inner surfaces of said tubular member and to the supply tube, the said supply tube con- This embodiment similarly to the embodiments i previously described is also readily adapted to use in combination with a pilot burner; as the space 24 is present therein corresponding to space I2 of IFigure 1 and space I1 of Fig. 5 and thus this modification has all the advantages previously stated to be present in the other embodiments of the invention.

tainingra passage that merges with the internal channel of the tubular member through bailles vertically placed in the outlet end of said supply tube to direct the fiow of the gas. and the said I tubular member being depressed at the front thereof to form a space above the supply tube,

a pilot burner disposed in said space directly above the supply tube, a slot in the upper surface of the tubular member with continuous extent from one side of said space to the other side thereof to form ajet for the gas, and the internal channel of said tubular member gradually decreasing in cross-sectional area in its travel from the-front to the rear of the burner to maintain the `pressure of the gas with decrease in volume.

y ERNST R. KOPPEY-a. 

